Dear Dish-It

It's complicated.

Yes... It's me, Emmalise. I never thought I would use a form asking for opinions, but here I am.
Here we go.
This guy has been one of my best friends for a year or so.
He just stared dating a girl a few days ago- but last night he treated me.. Oddly.
His girlfriend wasn't there and we were at a laser tag lock-in.
He hugged me and stuff and stayed with me all night.
Even friends of his were asking if we were dating.
I asked him why he did that and all he replied with was "Change of heart, I guess."
LolWUT.
What in the heck is going on?